Raycasting Help

The problem i have is the AI should look at the player then when it hits a object with the tag Prop stop looking at the player and rotate then wait and look at the player again. This is my first attamp at AI and Raycasting so i am in a bit over my head i understand the logic of it but cant seem to get it coded correctly. I hope someone can help with this and if you do thanks :)

here is the code

 var target : Transform;
 var robotController : CharacterController;
 var speed : float = 20.5;
 var backwardsSpeed : float =-20.5;
 var rayLength : float;
 var lookAtPlayerTime : float;
 function Start()
 {
     target = GameObject.Find("MadDoc").GetComponent(Transform);
     robotController = GetComponent("CharacterController");
 }
 
 function Update()
 {
 
     
     var dir = transform.TransformDirection(Vector3.forward);
     var dirleft = transform.TransformDirection(Vector3.left);
     var dirright = transform.TransformDirection(Vector3.right);
     var hit : RaycastHit;
     Debug.DrawRay(transform.position, dir * rayLength, Color.black);
     Debug.DrawRay(transform.position, dirleft * rayLength, Color.black);
     Debug.DrawRay(transform.position, dirleft * rayLength, Color.black);
 
     if(!Physics.Raycast(transform.position, dir, hit, rayLength))
        {
                if(hit.collider.gameObject.tag == "Prop")
                {
                    transform.Rotate(0,30 * Time.deltaTime,0);
                    var forward1 : Vector3 = transform.TransformDirection(Vector3.forward);
                 var curSpeed1 : float = speed * Time.deltaTime;
                 robotController.SimpleMove(forward1 * curSpeed1);
                }
                
        }
        else 
        {    
                var forward : Vector3 = transform.TransformDirection(Vector3.forward);
             var curSpeed : float = speed * Time.deltaTime;
             robotController.SimpleMove(forward * curSpeed);    
             LookAtPlayer();
        }
        
      
 
          
 }
 function LookAtPlayer()
 {    
     yield WaitForSeconds(lookAtPlayerTime);
     transform.LookAt(target);
 }